PCI-E Bifurcation

[chx]

Bifurcation and 4 way SLI support has nothing to do with each other. You can take a Threadripper motherboard and drop four cards into it. You can use it for GPGPU or rendering purposes, no problems. It'll run at 16/16/8/8 or an EPYC board and all four will happily run at x16 (if you can drop the money for four 2080 Ti cards, a $600 motherboard and a 550-4600 USD CPU is nothing -- gamepc is your workstation expert, they have all these in stock and know what fits together). But the SLI drivers, the NV LINK bridges won't support them as they do with two Turing cards.

 

[NinoPecorino]

@amback

asrock is very consistent with supporting bifurcation on their itx motherboards, but in order to do sli on a bifurcation riser the motherboard must also have sli certification from nvidia and as far as i know there aren't any itx motherboards with sli certification. you could probably find a way around it, but it will most likely be costly, inconvenient and inconsistent.

 

[amback]

Bifurcation and 4 way SLI support has nothing to do with each other. You can take a Threadripper motherboard and drop four cards into it. You can use it for GPGPU or rendering purposes, no problems. It'll run at 16/16/8/8 or an EPYC board and all four will happily run at x16 (if you can drop the money for four 2080 Ti cards, a $600 motherboard and a 550-4600 USD CPU is nothing -- gamepc is your workstation expert, they have all these in stock and know what fits together). But the SLI drivers, the NV LINK bridges won't support them as they do with two Turing cards.

wait so when it comes to gaming then it will not work in a 4 way sli configuration even for old tittles like gta v?, also is it possible to make the sli go through pcie and bypass the need for nvlink just like you can do with amd cards?

 

[amback]

@amback

asrock is very consistent with supporting bifurcation on their itx motherboards, but in order to do sli on a bifurcation riser the motherboard must also have sli certification from nvidia and as far as i know there aren't any itx motherboards with sli certification. you could probably find a way around it, but it will most likely be costly, inconvenient and inconsistent.

Is there any way to run sli via the pcie just like you can do with amd and their crossfire technology without the need of a sli-bridge/nvlink?

 

[NinoPecorino]

Is there any way to run sli via the pcie just like you can do with amd and their crossfire technology without the need of a sli-bridge/nvlink?

https://forums.geforce.com/default/topic/794072/can-sli-currently-work-without-a-bridge-/

 

[xSanchez78]

@NinoPecorino If you check out @LukeD's Project Orthrus build, he got SLI working on an ITX board perfectly. All he did was "inject" the SLI certification himself. There is a tutorial I found online, it's time consuming but it's not "costly" and you just do it once and you're done, and everything works perfectly fine just like on a true SLI certified motherboard.

https://www.win-raid.com/t2717f16-G...nboard-SLI-compatible-without-a-BIOS-mod.html

 

[NinoPecorino]

@NinoPecorino If you check out @LukeD's Project Orthrus build, he got SLI working on an ITX board perfectly. All he did was "inject" the SLI certification himself. There is a tutorial I found online, it's time consuming but it's not "costly" and you just do it once and you're done, and everything works perfectly fine just like on a true SLI certified motherboard.

https://www.win-raid.com/t2717f16-G...nboard-SLI-compatible-without-a-BIOS-mod.html

oh that's fantastic!

 

[VisualStim]

is there a list of bifurcation compatible motherboards?

 

[aquelito]

To my knwoledge :

Asrock Fatal1ty Z170 Gaming-ITX/ac
Asrock Fatal1ty Z270 Gaming-ITX/ac
Asrock Fatal1ty Z370 Gaming-ITX/ac
Asrock X99E-ITX/ac
Asrock X299E-ITX/ac

Asrock Fatal1ty AB350 Gaming-ITX/ac
Asrock Fatal1ty X370 Gaming-ITX/ac

Gigabyte GA-Z170N-WIFI

Gigabyte GA-Z270N-GAMING5
Gigabyte GA-Z370N-WIFI

Supermicro X11SSV-Q, which I currently use
Supermicro X11SCV-Q, supported after next BIOS update​

 

[VisualStim]

whelp i guess that project is not happening. I got a Asus Z370i for a good price thanks

 

[fabio]

Guys, sorry, someone knows if there are some riser for bifurcation that can be mounted in case like the DAN or the GHOST? I was thinking to have a double single slot RTX 4000. Thanks in advance!

 

[Windfall]

Guys, sorry, someone knows if there are some riser for bifurcation that can be mounted in case like the DAN or the GHOST? I was thinking to have a double single slot RTX 4000. Thanks in advance!

The SM550 has support for a build like that.

Look at the riser options.

http://www.sliger.com/products/cases/sm550/

 

[fabio]

The SM550 has support for a build like that.

Look at the riser options.

http://www.sliger.com/products/cases/sm550/

That's cool! But I think that is fixed on the chassis...

 

[Windfall]

That's cool! But I think that is fixed on the chassis...

You can get the riser from Amerirack. Pinging @KSliger to confirm.

 

[TristanDuboisOLG]

whelp i guess that project is not happening. I got a Asus Z370i for a good price thanks

You may want to think again. Their support list is pretty shit but you may either be able to enable bifurcation in your BIOS yourself or add it to a custom bios. I believe you need to look for a setting called "PCI Enumeration". Though I may be wrong.

This is their official comparability list for ASUS products that support the Hyper M.2. I know that these bios's support bifurcation so I'd assume that ASUS is familiar with the tech.

https://www.asus.com/us/Motherboard-Accessories/HYPER-M-2-X16-CARD/specifications/

 

[KSliger]

That's cool! But I think that is fixed on the chassis...

It's just screwed on, 4 screws into riser and then the riser bracket screws into the chassis rib via 2 screws.

We will have the riser available for purchase as a standalone riser later.

Also the SM560 is coming next week, and it is 3-slot wide with bifurcation support.

See teaser with GTX 1070 and an AverMedia Live Gamer 4K in A4 layout:

Definitely check your BIOS first, a lot of these boards say they support it and you have to send it back in to be modified to unlock it. New Gigabyte and ASRock boards though are easy to get it working on.

You can get the riser from Amerirack. Pinging @KSliger to confirm.

Can confirm, it's the ARC1-PERY423-C20(reversed, w/20cm ribbon to face over the board)

 

[TristanDuboisOLG]

Asrock Fatal1ty Z170 Gaming-ITX/ac
Asrock Fatal1ty Z270 Gaming-ITX/ac
Asrock Fatal1ty Z370 Gaming-ITX/ac
Asrock X99E-ITX/ac
Asrock X299E-ITX/ac

Asrock Fatal1ty AB350 Gaming-ITX/ac
Asrock Fatal1ty X370 Gaming-ITX/ac

Gigabyte GA-Z170N-WIFI
Gigabyte GA-Z270N-GAMING5
Gigabyte GA-Z370N-WIFI

Supermicro X11SSV-Q, which I currently use
Supermicro X11SCV-Q, supported after next BIOS update

I would also proudly like to add the Asrock x99e-ITX/ac to that list with bios revision 3.81

 

[rokabeka]

I would also proudly like to add the Asrock x99e-ITX/ac to that list with bios revision 3.81

and the Asrock Rack EPC612D4I, too

 

[KSliger]

Gigabyte Z390 AORUS PRO WIFI works as well!

 

[TristanDuboisOLG]

I think all of the boards listed on the M.2 Ultra (Asrock) and Hyper M.2 (Asus) compatibility lists also support it.


Asrock list:

X299 OC Formula	PCIE1	PCIE5	N/A	P1.20
X299 Taichi XE	PCIE1	PCIE3	Yes	P1.00
X299 Taichi	PCIE1	PCIE3	N/A	P1.70
Fatal1ty X299 Professional Gaming i9 XE	PCIE1	PCIE3	Yes	P1.00
Fatal1ty X299 Professional Gaming i9	PCIE1	PCIE3	N/A	P1.50
Fatal1ty X299 Gaming K6	PCIE1	PCIE3	N/A	P1.40
X299 Extreme4	PCIE2	PCIE3	Yes	P1.00
X299M Extreme4	PCIE1	PCIE2	Yes	P1.00
X299 Killer SLI/ac	PCIE1	PCIE3	N/A	P1.40
X399 Taichi	PCIE4	N/A	N/A	P1.90
Fatal1ty X399 Professional Gaming	PCIE4	N/A	N/A	P1.90
X399M Taichi	PCIE2	N/A	N/A	P1.00
X399 Phantom Gaming 6